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       1                 :             : /* Routines for expanding from SSA form to RTL.
       2                 :             :    Copyright (C) 2009-2025 Free Software Foundation, Inc.
       3                 :             : 
       4                 :             : This file is part of GCC.
       5                 :             : 
       6                 :             : GCC is free software; you can redistribute it and/or modify
       7                 :             : it under the terms of the GNU General Public License as published by
       8                 :             : the Free Software Foundation; either version 3, or (at your option)
       9                 :             : any later version.
      10                 :             : 
      11                 :             : GCC is distributed in the hope that it will be useful,
      12                 :             : but WITHOUT ANY WARRANTY; without even the implied warranty of
      13                 :             : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14                 :             : GNU General Public License for more details.
      15                 :             : 
      16                 :             : You should have received a copy of the GNU General Public License
      17                 :             : along with GCC; see the file COPYING3.  If not see
      18                 :             : <http://www.gnu.org/licenses/>.  */
      19                 :             : 
      20                 :             : 
      21                 :             : #ifndef GCC_TREE_OUTOF_SSA_H
      22                 :             : #define GCC_TREE_OUTOF_SSA_H
      23                 :             : 
      24                 :             : 
      25                 :             : /* This structure (of which only a singleton SA exists) is used to
      26                 :             :    pass around information between the outof-SSA functions, cfgexpand
      27                 :             :    and expand itself.  */
      28                 :             : struct ssaexpand
      29                 :             : {
      30                 :             :   /* The computed partitions of SSA names are stored here.  */
      31                 :             :   var_map map;
      32                 :             : 
      33                 :             :   /* For an SSA name version V bit V is set iff TER decided that
      34                 :             :      its definition should be forwarded.  */
      35                 :             :   bitmap values;
      36                 :             : 
      37                 :             :   /* For a partition number I partition_to_pseudo[I] contains the
      38                 :             :      RTL expression of the allocated space of it (either a MEM or
      39                 :             :      a pseudos REG).  */
      40                 :             :   rtx *partition_to_pseudo;
      41                 :             : 
      42                 :             :   /* If partition I contains an SSA name that has a default def for a
      43                 :             :      parameter, bit I will be set in this bitmap.  */
      44                 :             :   bitmap partitions_for_parm_default_defs;
      45                 :             : 
      46                 :             :   /* If partition I contains an SSA name that has an undefined value,
      47                 :             :      bit I will be set in this bitmap.  */
      48                 :             :   bitmap partitions_for_undefined_values;
      49                 :             : };
      50                 :             : 
      51                 :             : /* This is the singleton described above.  */
      52                 :             : extern struct ssaexpand SA;
      53                 :             : 
      54                 :             : /* Returns the RTX expression representing the storage of the outof-SSA
      55                 :             :    partition that the SSA name EXP is a member of.  */
      56                 :             : inline rtx
      57                 :    44878239 : get_rtx_for_ssa_name (tree exp)
      58                 :             : {
      59                 :    44878239 :   int p = partition_find (SA.map->var_partition, SSA_NAME_VERSION (exp));
      60                 :    44878239 :   if (SA.map->partition_to_view)
      61                 :    44878239 :     p = SA.map->partition_to_view[p];
      62                 :    44878239 :   gcc_assert (p != NO_PARTITION);
      63                 :    44878239 :   return SA.partition_to_pseudo[p];
      64                 :             : }
      65                 :             : 
      66                 :             : /* If TER decided to forward the definition of SSA name EXP this function
      67                 :             :    returns the defining statement, otherwise NULL.  */
      68                 :             : inline gimple *
      69                 :   127116694 : get_gimple_for_ssa_name (tree exp)
      70                 :             : {
      71                 :   127116694 :   int v = SSA_NAME_VERSION (exp);
      72                 :   127116694 :   if (SA.values && bitmap_bit_p (SA.values, v))
      73                 :    27540265 :     return SSA_NAME_DEF_STMT (exp);
      74                 :             :   return NULL;
      75                 :             : }
      76                 :             : 
      77                 :             : extern bool ssa_is_replaceable_p (gimple *stmt);
      78                 :             : extern void finish_out_of_ssa (struct ssaexpand *sa);
      79                 :             : extern unsigned int rewrite_out_of_ssa (struct ssaexpand *sa);
      80                 :             : extern void expand_phi_nodes (struct ssaexpand *sa);
      81                 :             : 
      82                 :             : #endif /* GCC_TREE_OUTOF_SSA_H */